copious, heatwarming,

When tears finally come (usually over something less significant), they can be more copious than one would expect because they have been bottled up.

copious (adj.) 

mid-14c., from Latin copiosus "plentiful," from copia "an abundance, ample supply, profusion, plenty," from com- "with" (see com-) + ops (genitiveopis) "power, wealth, resources," from PIE root *op- (1) "to work, produce in abundance," (see opus). Related: Copiously.

opus (n.) 

"a work, composition," especially a musical one, 1809, from Latin opus "a work, labor, exertion" (source of Italian opera, French oeuvre, Spanish obra), from PIE root *op- (1) "to work, produce in abundance" (Germanic *ob-) "to work, produce in abundance," originally of agriculture later extended to religious acts (cognates: Sanskrit apas- "work, religious act;" Avestan hvapah- "good deed;" Old High German uoben "to start work, to practice, to honor;" German üben "to exercise, practice;" Dutch oefenen, Old Norse æfa, Danish øve "to exercise, practice;" Old English æfnan "to perform, work, do," afol "power"). The plural, seldom used as such, is opera.

I'm a 73-year-old man. Over the years I have sometimes cried over sad, heartwarming stories in books or on TV, especially those involving children.

I have also lost several loved ones, and although I was as sad about these losses as anyone else, I was never able to shed tears over it.

Why do I cry over things that don't pertain to me or anybody in my life, but can't when someone I love passes away? Is something wrong with me?