Not sure 'melancholy' is the right word, but... he is a fine young man, and I am very proud of him (doing Maths, Physics, Chemistry 'A' levels), but more and more I find myself looking at little ones when I'm out and about, and wishing so much I could go back there...
Also have DS2 and DD, so very lucky with my lovely family, but -these pangs are so unexpected... not sure what to make of them. I suppose it's the prospect of DS1 leaving the nest next year, swiftly followed by the other two - not much time between them.