Why is my iphone charging extremely slowly?

I have an iPhone 4S had it for about 3 years now and today it is charging extremely slow. It was on 90% and took almost an hour to get to 92%. This has happened before some months ago but I switched over the adapter and it was fine. This has not worked this time. Any suggestions as I can't afford a new phone right now

Yes tjkh

May be either the phone that is old or the charger that is old, and week.

Hm could be anything. Could be the power source you're using, or it perhaps something else is draining your battery. Once I was on Skype on my phone whilst it was on charge, and it informed me my battery was being drained faster than it was charging. Try shutting off all the apps and resetting your phone, or even turning it off altogether. Even go through your apps and delete what you don't need/use. Replace the battery if possible.

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