What would make me look younger?

Eglantine I so agree.
Many a time I have had to resist the temptation to hoick a person's bra strap up from the shoulder.

A good uplifting bra. So many ladies around with low hung busts!!!!!!!

Good hairstyle, stylish clothes, don't be overweight, have a ready smile.

I think that if you smile, keep as active as possible, and don't revert to crimpolene you should be okay.

To keep an enquiringly mind helps as we are never to old to learn.

Not leaning on the supermarket trolley as though you are unable to stand unsupported. (Unless you are disabled of course).
Cheerful smile is definately anti aging to the face.

Clattering around in heels which are too high, I think.
The strain shows on some people.

Wrinkles
Agree with all the above.
I think walking with a straight step forward and not shuffling
I am constantly on the look out for this with DH and myself as we have /had a parent and grandparent with dementia and this was one of the first signs.