Hi glad to know that you are so much concerned about your skin care. i assume you stopped oral isotretinoin in consultation with your dermatologist. I am focusing this beacuse if it is stopped before reaching a particular dose or without a good clinical accumen, it might flare up due to incomplete treatment. Generally we stop oral isotretinoin after 2 months of clinical cure. Regarding topical retinoids for maintanance and its antiaging property it is an excellent idea. For topical retinoids here in nepal and especially for males there is no such strict regulation. You can buy and continue that with yearly followup with your dermatologist. However before starting i would suggest you to consult a dermatologist and identify which type of retinoid and may be routine skin care products are suitable for you. I hope i was able to clarify your concerns.