Do older iPhones get slower over time?

My brother and I are not getting new iPhones this year (which I could care less about) and we currently have the iPhone 4s. My brother told me that overtime the 4s will operate slower and slower as the new upgrades emerge over the years so therefore we should be getting new phones. Is this true or is he just being a greedy brat?

Added (1). Do you think that if I just choose not to update the versions it could still be functional for at least 2 years? We just can't really afford to buy a brand new phone.

Picking a digital camera, a specific purpose?

I often get see eye-candy and I want to take a quick picture of it or I need to take memos so I need also a screen to look back at them.

I need the camera to:
- Boot quickly (point and click for an instant picture)
- Mediocre shutter speed
- Digital with Screen, to review/view photos
- Focus (otherwise 12pt text is all blurry, smudged and I NEED TO READ IT)
- Physical size smaller than an iPhone (I won't keep it in my pocket)
- I don't care for screen Size
- Mediocre battery life, I only take or view 0-3 photos a day
- Cheap price
- Robust (if I knock it by accident I don't want it to shatter into a gazilion pieces, like iPhones do)

Anyone can recommend me something? Maybe someone used something like this in the past.

How to take a non blurry selfie?

I have seen a lot of people on instagram take really clear selfies without it being blurry at al. How do they do that? All of my selfies are at least a little blurry. I have an iphone 4. If there are apps to use please suggest free ones.

Best app for followers etc on instagram?

I'm looking for a free app that doesn't make you buy the extra features. I want it to show who's not following back, who i'm not following back, who unfollows me, who blocks me, average likes, etc. Any good apps out there for iphone? 10 points to user who submits best app.

Make volume of songs louder on iPhone?

I have certain songs that sound great in iTunes on my iMac even at medium volume, but when I transfer them to my iPhone, they don't get very loud.

This isn't an issue with all songs, just some.

How to transfer all my iPhone data to my computer?

I dropped my iPhone and not only is the screen cracked but the actual view and touch system of the screen is messed up. So only the top right corner is appearing normally but the other 75% of the screen looks likes colorful vertical lines and doesn't respond to touch. I still have the phone and backed up my phone on my itunes but was wondering if it would include all my "Notes" and "Contacts" data on there so when I get another iPhone. I could simply back it up to that new iPhone. If not, then is there another way?