I have 5 kids, my eldest was 4 and 1/2 , my twins were 2 and 1/2 when my next set of twins were born. To be honest the all merged into one as I had no time for any of them except the eldest before the first set of twins were born. they are all teenagers and looking back I really wished I had a bigger age gap like 5 years, least then the older one has your time for the first 5 years and then they go to school and you have time to spend with the next one, having mine so close together did not make then close they all hate each other and our house is a constant battle zone.
Everyone is different, but the ones I have spoken to who have 5 year age gap seems to have worked fine for them, they don't seem to compete for your attention so much.
Whatever you decide I am sure it will work out for you.