So much analysis isn't really necessary.
For counting 'presence in Canada', that day is 1 day in Canada.
For 'police certificate' purpose, that day is 1 day in the US.
Doesn't have to be logical - just make sure CIC gets what it wants.
Low iq maybe.
Spyfy's post #2 is misleading. "Applying" can mean mailing out OR application received at CIC - which are not the dates used to calculate 3/5 years requirement. The only date that matters for this calculation is the date application is signed.
I'm sure some people will find my...
Yes, seriously. Read your own post:
"Sign this application" - the key phrase. That date is used to calculate your eligibility.
If what you mean by "day before applying" (in post# 2) -> "day before signing", then I have no qualms with you.
More experience is seriously overrated. Anything more than 3-5 years experience doesn't add much additional value (except for medical professional and research scientists/engineers).
The younger one is indeed more valuable for Canadian economy. He/she can earn a Masters or PhD in Canada and still have more working years left than the older guy.