You are not old at all for quadskating (my mother learned at 35). I think you are one of the youngest on this forum!!!
I came back to vert skating at 36 (3years ago) and recovered my skills and greatly improved them far beyond I could imagine then. At the begining I used my old skates, so please take yours, pad yourself and enjoy!!!!!! Maybe upgrade your bearings if they got rusty, or the bushings.
15 years old wheels in good condition are still very good (and high priced on the used market)
For vert, some improvements have been done for having hard and grippy wheels (Powell parc formula).
Here in France, many quad skaters have also used inlines and come back to their roots, so you are not alone!!!!
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