A friend suggested to me when I was approaching an age a multiple of ten that it's good to check achievements, but not to hold yourself to any particular moment that they should have been completed by, that ages are milestones, not truly deadlines.
From the article's conclusion:
"I went back and recommitted to my “to do list,” but with one major edit: I deleted “by 40” and added “inshallah” (Arabic for God willing.)"