The last years I was working with MQL4 and I dont want to change to MQL5.
What are the plans of metatrader ?
Will MQL4 be alive the next 10 years or must I learn MQL5 ?
We are users here so we don't know what Metaquotes' plans are, only that they don't intend to continue to develop MT4. They are still doing updates though to correct bugs.
We can only guess that MT4 will continue as long as there is a demand for it.