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Exactly!

Literally, it is like "It was 15 years to me".

But there's another example:

Я был пятнадцатилетним парнем. = I was a 15-years-old guy. Now "я" is a subject, and therefore we say "Я...

The only valid option is: "У меня не было автобусов".

Note: you use neutral verb gender: "не было", since the sentence is impersonal. There is no subject. And "автобусов" cannot be a subject (a...