OP don’t seek medical advice on Reddit, people know shit here. Just fix your appointment with a good dermatologist and talk to them about your issue. There’s no “less age” to start this process. Many dermatologist complaint about people who approaching them at the age of 29-30 and complain about faster results.

Don’t take random biotin tablets on the recommendation of some Reddit user. You’ll be advised a dosage according to your issue. Consuming biotin more than the required amount can lead to rashes and multiple skin diseases. Don’t lose hope, just visit a derma and start the treatment, you’ll be satisfied with the results.