SavoyTruffle said:
Not very different, but I'd assume that being older he declines to be as involved in the ARW as his son.
Not so sure. The Dauphin Louis (thus TTL Louis XVI) might actually be able to handle the situation a bit better than OTL Louis XVI who was his eldest son. He has a bit of experience (he was Dauphin from the moment of his birth, unlike OTL Louis XVI who found himself Dauphin 9 years before Louis XV died), has been properly formed to be King (unlike OTL Louis XVI whose education was rushed, though he completed it himself later) and, unlike his son, doesn't lack guts (that was one of OTL Louis XVI's main problem).
Two great questions will arise during his reign: the American Revolutionnary War and the Economic Crisis that lead to the French Revolution. Regarding the first, it's possible he refuses to enter the War because of the cost it could have. On the other hand, it's a good occasion to give Britain a nice ass-kicking after the Seven Years War...
As for the second, he could deal with the situation better. If France doesn't take part in the ARW, the crisis will be less important and would technically only reached the scale it had a few years later than OTL: this might give him more time to deal with it. If France did took part in the ARW, he might deal with the situation better than OTL Louis XVI. At best, we get a Reformed French Monarchy (maybe Constitutional), at worts with a delayed French Revolution.