What size dumbbells?
Lifting weights is a gift for bone health, muscle health, inch loss, mood (and research just published rejuvenating aging skin) and I will ALWAYS encourage that you lift ‘heavy’ for YOU, whilst ALWAYS being mindful of injury and respectful of pelvic floor.
The weight of the dumbbell needed will also be dependant on the exercise and the main muscle being used! Which is also why you will usually need different sizes of dumbbells, and not usually as light as you think!