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Not too long, though. The sooner you start building your AAoA, the sooner you can go for the cards you want.
Well, part of the reason people go on 'app sprees' s because they get a cluster of accounts that age together, so your credit score takes a bigger dive in the present, but is stronger going from then.
For example:
1st card ever: Capital One
Average Age of Accounts is 1 month
A year later...
Average Age of Accounts is 12 months
...until you apply for a new card.
2nd card: Discover IT
Average Age is now 6 months
Versus taking on two cards:
Capital One and Amazon Store Card
AAoA is 1 month
A year later...
AAoA is 12 months
....and when you apply for a new card..
New card!
AAoA is now 8 months.
I hope that wasn't terribly confusing. It doesn't seem like a lot, but the newer your cards are, the slower your Average Age increases.