Thought
If you live in the now, there’s a good chance your heart controls your thought process. You don’t have time to think with your brain, you need an answer now so you use your heart to make decisions and thought process.
Think about the last time you thought it was right to make a decision with your heart. What was it? Use these emotions to remember this kanji.
ねん
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You're living in the now and letting your heart control all your thoughts. Why are you following your heart? You found you only have one 年 (ねん) to live, so you have to live for the now.
Think of all the things you'd do with your life if you only had one 年 left. Maybe you should go do some of them anyways, right now?