The main reason why footballers retires from country quickly and face the club side is because club side pays them than the little amount they earn at country side and country don't always have competition they would participate in. Even Lionel Messi has once announced his retirement from his country side (Argentina) in some years back but Argentina know that there's nothing they can do without Lionel Messi and it's true because he help them won their continent league in some months back and Lionel Messi has even developed interest in his country now, he has the clause in his contract with Paris Saint German that he would always answer Argentina's call whenever they call him.
Pierre Emerrick Aubameyang had the chance to play for Spain because his mother is a Spanish but he choose to play in his father's country, he so much love his father's land, maybe he prefer Africa than the Europe that he is. Aubameyang has tried so much for Gabon, the record he has would be very hard to break, he is the most goal scorer for Gabon, he scored 30 goals for them and played 72 games for the country. He's a true legend though but the fact that Gabon didn't win anything during the time he was with them didn't make his legend like Sadio Mané.
Aubameyang's father also played for Gabon but he is not an atacker like his son, he was a defender and he was the captain of the team and Aubameyang too is still the caption of the team, although they would need to bring five the captain band to someone else now because he has choose to retire from his country side. Pierre Emerick Aubameyang has write a letter of retirement to his country that he is retiring but country never reply him, we never know if they would beg him to play more games like Argentina begged Lionel Messi