Should I feel bad about winning?

I am 30 and this past recently became ymca national champion in 3 events. Here is my problem. The times I posted were far from blazing. I just got back into swimming last fall and it just turned out that the competition for my age group in this particular year was not strong. I know that this will not happen again. Should I just enjoy the victory as it is? I feel guilty saying I am a national champ knowing older age groups were tougher competition? How would you feel? Thanks