What's the point of growing old

Allow me the hubris of revision:

Chapter One
What's the point of growing old
Everything said is left as if untold
Every step vanishes from one night's sleep
Every joy erased by a tragedy

What's the point in growing old

Hands that once held a lovers embrace
Now shake uncontrollably in embarrassing haste
Smiles once held tight wide and white
Leave wrinkles and your teeth fall out what a terrible sight

What's the point of growing old

This is a trilogy of age, because the answer to your question shifts dramatically over time. You've written the first stanzas from experiences. The others will come when they, too, are properly aged.