I'd like to think I will never stop doing sessions entirely.

The only definitive reason I think that someone should stop doing sessions is if they do not enjoy them anymore.
Realistically you can't do every type of domination play forever, I imagine at some point you can't take as much corporal punishment anymore compared to when you were younger, but there's always kinks and interests to explore that won't be dangerous to your health.

So long as I'm still in love with femdom play i'll continue to session in some way. You can't stop my one-hundred year old future self from being an obedient boot licker!