Exposure to the sun without getting red reduces wrinkles because it strengthens subcutaneous tissue and fills in the wrinkles. However, wrinkles will be produced when skin damage does occur by being over exposed. Also, sun exposure guarantees no over dosage of vitamin D because the skin will tan slowly, when done responsibly, and prevent over dosage because the skin gets darker and limits dose.
It is important to find out what kind of lamp is being used when in a tanning salon. It should not be a high pressure lamp as that emphasizes rays that are not as beneficial. We are trying to imitate what the sun puts out in spectrum of rays. Tanning also requires responsible behavior. Children should be monitored by adults. That is what parents are supposed to do. Something I am afraid is lacking in today's society on all levels.