Do teens with ms progress to disability faster than adults? And what's the outlook for a teen with ms nowadays?

Complex question. The earlier MS is diagnosed it tends to have a more rapid decline, but this depends on so much such as what type of MS you have, treatments available to you and past progression and family member progression if applicable. I wish I could have a more concrete answer for you, but the disease is so complex its hard to answer from in a few hundred characters on here. Wishing you all the best.