Answer:
Simple past tense: I loved hiking when I was 12.
Present perfect tense: I have always loved hiking since childhood.
Simple past: when something you did but now you do not do it anymore.
Present perfect: when you did something and still doing it, that is present perfect tense.
For example: In the sentence, I wrote a simple past tense of love, and that sentence defines that I loved hiking, but now I do not love it anymore.
In the second sentence, I wrote the present perfect form of love, which is have loved, which explains I loved hiking when I was a child, and I still love it.