If it's of any help ... there is 5years between my younger sister & i and WE had no issues with any age gap if you can call it that growing up ... put it this way my sister & i were so close that i named my only child's middle name after her ... and i had my 1st bub at 40 ... (i lost 10kilo's before i fell pregnant with and felt better for it)

GOOD-LUCK with whatever you decide to do

Hugs from Lorelle & Miss C xoxox