Same here - I was 49 and he is now 19 months, good to hear there is hope for me :)
A little off topic but my dad was 40 when I was born and, to be honest, I was a bit funny that he was much older than my friend's dads. Ironic :)
I will be as young and as energetic as I need to be to give him a great childhood. Advantages over his friends? I can be his dad and grandad in one and his inheritance is closer :)
Seriously, really a gift from god and I don't care how much it costs but as said earlier, love, attention and time don't cost anything.