No Strings Attached

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Before Walter-Dudey became this nice, middle-aged mellow cat,
He was rarely super nice. If he was, it usually involved , food, food,food.
But there was this one other occasion.
When he spotted you outside of the house.
He'd come running to us and be "purr-purr-purr-ing" and rubbing himself against our feet and on Zumzum's pushchair.
Something about cats seeing their humans outside makes them No-strings-attached nice, even the not so usually friendly ones.
Why is that!?

Now that Walter is eight years old, I find him more mellow, and nicer, and even more affectionate. He's actually happy to be stroked most of he time, instead of sighing at me and running off with his tail bouncing in the air from annoyance.
Middle age must be not so bad then.