Is 5 years too big of a gap between siblings?

I worry my son will never play or have much interest about his baby brother that will be born when he turns 5. ☹️

I wish I had planned things better but I was never ready for a second kid, I was set in being a one and done type of parent until … well … sh!t happens lol.

So now that I think about it, feels like my 1st will be too old to want to play with his brother etc.

What do you guys think?