How do Muslims view left-handers among their own religious group,
particularly among individuals aged 16 to 25 years and those aged 40
years and above. Reference to at least 3 different sources (websites,
articles, journals).

I also need stats (and any numbers) for comparison between
the two age groups, preferably among the South East Asian community.

In Islam,using left hand by any group of age,is not a sin .But in
Islam,it is always recomended and prefered to use right hand.
I cannot understand which type of comparision do you want.Please be more specific.
Regards
Ijaz Ahmad
Lahore-Pakistan

I'm trying to find the comparison of the two mentioned age groups with
respect to the acceptance & tolerance of lefthandedness within the
Islamic community.

For example, the older generation may find it less tolerant for a
member of their family (eg. a child) to be lefthanded and therefore,
insist on that individual to switch handedness. On the other hand, we
may find a growing level of tolerance towards lefthandedness within
the present generation. I'm looking for such change in attitude
between the two age groups, with support of stats and such, as well as
any related historical incidents of intolerance, if any.

Hope that helps.