Car sometimes wont start randomly?

I have a ford ka, that randomly doesn t start there isn t any pattern with it. When it starts is perfectly fine, its 11years old.

It sometimes sounds like its going to start but then doesn t, always fire. I cycle the key a few times and it will eventually go. If I start it every few hours its fine, bit if I leave it it doesn t want to start.

Its had the spark plugs changed and some other sensors as well as the leads to the engine (I m not sure the correct names) the car it self sounds better but it still sometimes doesn t want to start.

Any ideas why or is it just getting to the end of its life?
Thanks in advance.

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