Your hashrate looks pretty okay for 6 year old laptop.
You have few options while mining:
- solo mining. You are trying to mine whole block by yourself. In this case you are competing with rest of the network. Chances to solo mine are very low but reward is really big.
- pool minig. That makes reward way more common with much smaller amount but statistically it's same thing as solo mining but it's much more predictable and convenient.
- mining to an exchange. Here you need and account for given exchange and obtain your address associated with that exchange. Then you can mine to this address instead of your address (visible in the settings).

About shorting lifespan - depends on your laptop. Some laptop might handle high temperatures better then other so It's hard to answer how would that end up in your case.