You sound exactly like me, same age, maybe not AS far away from each other LDRwise (me and DP are 2 hours apart).Me and DP are both raising a junior school aged child each.
All you say here is what I go thru and I think its just the dynamics of a LDR.
I am also 50 (51 to be exact)and DP is the first person I have ever introduced to my DD and I feel very seriously for him, as he does me.
The thing is - I am 51 - (luckily I do look younger and am 'fit'healthwise). But our clock is ticking away a lot faster than someone not in this age group (or that is how I feel sometimes). We also know what we want out of relationship and a LDR can fall a bit bald in the inbetween stages of meets.
I have also posted on here about the hurdles that can rise from a LDR... some of which I have sorted out. But believe me I know where you are coming from.
Some days you are fine with it, other days the feeling of being disatisfied totally creep in. Lots of boring lonely evenings when you feel you should be with someone and then creeping into an empty bed when you've got so much to share.... and noone there to share it with.
I have been with my guy now for over 14months and I sometimes feel I am basically in the same spot to when we started. I did have my doubts about it working out and said it would be hard to nurture. I get insecure and feel like chucking it all in many times, but I have hung in there, mainly due to him.
the whole pace is different, the meets are passionate and you don't want to sit and brew over the past weeks negative feelings as they disappear when you're with them. I know all about that.
But I say this, maybe there are other chaps out there to wine and dine me and call in on the offchance, have a cuppa and be more involved, the thing is, when you're inlove (like I feel I am) you settle for quality of feeling and not 'quantity of visits'.
As for the communication, this can be sorted and explain the importance of it to him. I did, and he accomodated, busy or not busy. I demanded proper communication with him and he came through.
It is different with a LDR, I know how you feel.