I'm 58 years old and seeking advice on buttock rehabilitation. Options for sagging, wrinkles and lack of definition? (photo)

I am 58 years old, slim and fit but with a multi-problem behind: Sagging, wrinkles and lack of definition. Part of this is related to age, but also to a loss of about 8 pounds over the past 2 years. I do not have the downtime for a BBL &am considering Sculptra. But I also wonder if addressing the wrinkles/cellulite and/or reducing fat on upper thighs would do enough to improve the overall look while I continue to exercise to tone and firm