I did the same thing when my grandfather died: A grid with each square representing a week of his life, and each row representing one year. Then, we mapped as many events from his life as possible.
Oh no, I don't go in that details, simply, every month, the weeks start on 1st, 8th, 15th, 22nd.
Only Jan, Jun, July, Dec gets another week, 5th one, on 27th.
So all months have 4 columns, labeled 1,8,15,22. Jan, Jun, Jul, Dec have 5 columns.
Whole sheet is a fillable grid of 52 columns and 90 rows.
A pre column list the year like 2002, 2003, 2004 etc. Next pre column list my age like 0,1,2,3 till 90. Then above explained grid. Then again, first two pre columns copied.
Each cell has light grey border. Border darkens to black between months columns. Border also darkens at every decade row.
If an event (like travel) happens on certain date (like 13th), it simply fills the whole week.
I assume that in overall big picture of life, a rounding off of week will not matter much.
[1] https://waitbutwhy.com/2016/10/100-blocks-day.html [2] https://github.com/am-on/work-timer