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Level 1
I think the past levels before your current one should be free to do as you've completed them already. While future levels require hearts.
I get where you are coming from @CjmaDj and it would be nice if you could play old levels without losing lives. I suppose the problem is that a lot of the features/events can be completed by playing old levels, so King needs to make sure we can't obtain free boosters too easily.
Unfortunately another thing wrong with your idea is that all ideas related to lives have been banned by the Master List of Ideas
Here is the Master List
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Please note that many ideas get duplicated several times, therefore, below please find a list of topics that need not be addressed since these topics have been archived (will not be implemented)
Fantastic Five (any discussion on this event), Fish, Go to level (vote HERE for original idea), Levels (anything to do with lives or asking for level changes is not an idea/post it in the Discussion area), Lives (all, including asking for shorter time or more lives), Moves, Free Boosters/Gold Bars, or Rewards for being at the top (the studio is always hosting events and adding different ways for players to get free boosters and gold bars), Sharing (lives or boosters with friends), Timed boosters (they are on a clock so once the clock starts ticking it runs until time runs out), Wheel (the wheel was updated not too long ago).
Please do not create new ideas on any of these listed above. Please feel free to check out Tiffi's Idea Library for additional archived ideas. Thank you.
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I think Candy Crush Saga could be sweeter if giving lifes to fellow players was rewarded in some way. A Generosity reward.