Or perhaps I should say lessons which can help us to maintain a positive and purposeful approach to life despite diminished physical abilities. Feeling alive is purely a matter of attitude. Unfortunately people forget that their Ultimate Employer is G-d. They allow themselves to be identified by their human employment. And a person must remember that it is never too late to change.
Life goes on until death.
This may sound so obvious that it doesn't merit mention. But behind this obvious truth lies a promise. The promise is that a person as long as he lives can reinvent his life through Tshuvah. One more thing is worth mentioning here, the last Mishnah in Seder Kodshim. The first person to live into old age a full life was Sarah Imeinu.