I think it would be rather odd not to cry after losing a beloved pet. I still feel upset when I think of our 21 year old cat being put to sleep - and that was 6 years ago.
My own feeling is that getting older makes you more reflective and aware of things that a young person tends not to think about - a keener awareness of your own mortality and that of those close to you, and memories of people you have lost.
I don't understand how you can "set a time limit" for crying.
Sometimes I cry just because something comes into my mind that upsets or makes me anxious. It seems to me that some people just don't deal with the difficulties in life as easily as others and, to some extent, you just have to go with the flow.
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