So when I log into ledger live, I see all the transactions shown in the latest operations.  The thing is I haven't done many transactions the last few years.  But how many transactions does it show or suppose to show?  For example, it does go back all the way to when i sent some coins to my ledger.  But it doesn't show old transactions of when I transferred btc from my electrum to nano ledger s. 
I recall few months ago, I always see the first few transactions I did to the nano ledger s which was me sending btc from electrum to the nano ledger s.



Is it something like it only goes back X amount of years?  If so, is there a way to check older transactions?



Also a few times I have received either btc or bch dust transactions... heard that was the term... where you receive btc or bch but the amount is 0 USD but like its 0.00000000008 btc or bch which is nothing.  But some of these transactions are no longer there anymore in my transaction history?  Can someone explain this?  I know i received a btc/bch dust transaction not that long ago but how come it no longfer shows up in the latest operations?