Credit Question: Funding Properties

[Jacob Oser]

Newbie here. Love the community here at BP and since I can't think of anyone I know to ask this question to, I'm asking you guys. Something that I've been wondering about is whether new investors looking to buy their first property using a conventional mortgage use their personal credit to apply for the loan. My thoughts are that this would work great for FHA and BRRRR house hacking strategies but what about later on down the road when you decide to get a second rental? Once you grow to 3+ properties, wouldn't you be hurting your personal credit by continuing to open new accounts and thus lowering your average age of accounts?

How is this avoided or how do credit ratings factor in the real estate investor to not penalize them for success?