hi there, I dont think there is really any ideal age gap between kids only because you may choose to fall pg with a small age gap but in all honesty what you plan may not happen as you plan it. It may take longer to have that much wanted bub, and it may be quicker than you expect. So if you feel you are ready to ttc than start, if not then wait. JMO. All the best.
Actually I think I need to clarify what I mean, as it may have come across the wrong way. I have my first 2 with an age gap of 4yrs, my reasoning for that was so that I could give each child the attention they deserved while babies, so had one almost ready to start school, was at preschool when the second one arrived. Then I thought ok, there is no way I would have another until the next one was at school, only because he was a handful. We then started to TTC when the second started school and fell pg, but m/c at 16wks, then again fell pg a few months later and m/c at 12wks, then we needed to wait for approx another 4-6mths before TTC again, which we then had our 3rd, age gap of 7 1/2yrs, then low and behold a precious surprise while BFing our 4th born 13mths to the day from the 3rd. So of course I nagged DH to TTC again while the 4th was still at home and the 3rd was ready to start school the following yr. Well plans did not happen the way I would have liked, as 2 m/cs later and a yr after TTC again, I finally found out I was UTD with No. 5. So now leaving an age gap of 5yrs to no. 4.

So there you have it, have experienced both ends of the scale and both have their advantages and disadvantages and again it may or may not work out to what you would like. No matter what happens tho, once that bub is on its way you will be blessed either way. hugs