The long view of three cycles

Life-Cycle Milestone Chart

Mark birthdays, paired crossings and the rare occasions when all three classic biorhythm cycles meet or fully reset.

Ages 90–100Return to my current decade
18 Oct 2086 to 18 Oct 2096

Your cycle crossings

40markers in this window
Biorhythm milestones between ages 90 and 100Six tracks mark birthdays, paired zero crossings, triple crossings and complete resets. Birthdays Physical + emotional Physical + intellectual Emotional + intellectual All three at zero Complete reset age 90age 91age 92age 93age 94age 95age 96age 97age 98age 99age 100 18 Oct 2086 12:00 — 90th birthday. A personal anniversary marker. 12 Mar 2087 00:00 — Physical + intellectual. Both cycles cross zero together. 8 Aug 2087 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2087 12:00 — 91st birthday. A personal anniversary marker. 14 Nov 2087 12:00 — Emotional + intellectual. Both cycles cross zero together. 25 Mar 2088 12:00 — Physical + intellectual. Both cycles cross zero together. 25 Jun 2088 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2088 12:00 — 92nd birthday. A personal anniversary marker. 18 Feb 2089 12:00 — Emotional + intellectual. Both cycles cross zero together. 9 Apr 2089 00:00 — Physical + intellectual. Both cycles cross zero together. 13 May 2089 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2089 12:00 — 93rd birthday. A personal anniversary marker. 31 Mar 2090 12:00 — Physical + emotional. Both cycles cross zero together. 23 Apr 2090 12:00 — Physical + intellectual. Both cycles cross zero together. 26 May 2090 12:00 — Emotional + intellectual. Both cycles cross zero together. 18 Oct 2090 12:00 — 94th birthday. A personal anniversary marker. 16 Feb 2091 12:00 — Physical + emotional. Both cycles cross zero together. 8 May 2091 00:00 — Physical + intellectual. Both cycles cross zero together. 31 Aug 2091 12:00 — Emotional + intellectual. Both cycles cross zero together. 18 Oct 2091 12:00 — 95th birthday. A personal anniversary marker. 4 Jan 2092 12:00 — Physical + emotional. Both cycles cross zero together. 21 May 2092 12:00 — Physical + intellectual. Both cycles cross zero together. 18 Oct 2092 12:00 — 96th birthday. A personal anniversary marker. 21 Nov 2092 12:00 — Physical + emotional. Both cycles cross zero together. 5 Dec 2092 12:00 — Emotional + intellectual. Both cycles cross zero together. 5 Jun 2093 00:00 — Physical + intellectual. Both cycles cross zero together. 9 Oct 2093 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2093 12:00 — 97th birthday. A personal anniversary marker. 12 Mar 2094 12:00 — Emotional + intellectual. Both cycles cross zero together. 19 Jun 2094 12:00 — Physical + intellectual. Both cycles cross zero together. 27 Aug 2094 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2094 12:00 — 98th birthday. A personal anniversary marker. 17 Jun 2095 12:00 — Emotional + intellectual. Both cycles cross zero together. 4 Jul 2095 00:00 — Physical + intellectual. Both cycles cross zero together. 15 Jul 2095 12:00 — Physical + emotional. Both cycles cross zero together. 18 Oct 2095 12:00 — 99th birthday. A personal anniversary marker. 1 Jun 2096 12:00 — Physical + emotional. Both cycles cross zero together. 17 Jul 2096 12:00 — Physical + intellectual. Both cycles cross zero together. 21 Sep 2096 12:00 — Emotional + intellectual. Both cycles cross zero together. 18 Oct 2096 12:00 — 100th birthday. A personal anniversary marker.
BirthdayTwo cyclesAll three at zeroComplete reset
Physical + intellectual12 Mar 2087age 90.4 · Both cycles cross zero together.
Physical + emotional8 Aug 2087age 90.8 · Both cycles cross zero together.
Emotional + intellectual14 Nov 2087age 91.1 · Both cycles cross zero together.
Physical + intellectual25 Mar 2088age 91.4 · Both cycles cross zero together.
Rare whole-life markers

When all three classic cycles meet

Triple crossingAge 29.1

All three classic cycles meet at zero.

Triple crossingAge 58.2

All three classic cycles meet at zero.

Complete resetAge 58.2

All three cycles restart in their original direction.

Triple crossingAge 87.3

All three classic cycles meet at zero.

Crossing versus reset

Zero is a meeting point, not always a restart

Every classic cycle crosses zero twice per cycle: once while rising and once while falling. Two cycles can therefore share a zero crossing without restarting in the same direction.

A three-cycle zero crossing repeats after 10,626 days (about 29.1 years). A complete reset, with all three returning to zero in their original upward direction, repeats after 21,252 days (about 58.2 years).

Difference between a zero crossing and a full resetThree sine waves cross the centre line together, while arrows show that direction determines whether the moment is a full reset.shared zero crossingdirection decides reset
What the mathematics says

Why these dates repeat

Physical + emotional

Their zero crossings coincide every 322 days.

Physical + intellectual

Their zero crossings coincide every 379.5 days.

Emotional + intellectual

Their zero crossings coincide every 462 days.

These are mathematical coincidences within classic biorhythm theory, which is not scientifically established. The chart is for reflection and entertainment, not prediction.

Continue exploring

Move between a single day, a month, a whole year or the longer story of your cycles.

Daily view Biorhythm Calculator Zoom into the physical, emotional and intellectual curves around a chosen day. Month view Personal Calendar Follow the three classic cycles through a focused month-by-month calendar. Two people Compatibility Chart Place two personal patterns together and explore where their rhythms align. Seven rhythms Extended Chart Add intuition, creativity, awareness and spiritual cycles to the classic three.