Will my cats have shorter lifespan if they never had kitten food?

I rescued them as strays at 2 months but I didn't know anything about cats so I just fed them regular cat food. But kitten food have all these "healthy brain" and stuff and I feel like my cats probably didn't get the nutrients they needed. They're 3 years old now and really healthy but for how... show more I rescued them as strays at 2 months but I didn't know anything about cats so I just fed them regular cat food. But kitten food have all these "healthy brain" and stuff and I feel like my cats probably didn't get the nutrients they needed. They're 3 years old now and really healthy but for how long...
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