A source of vitamins - healthy fruit, the Eden story a snake gave an apple to Eve - understanding/knowledge, Snow-white fairy-tell - poison thing - malice / desire / jalousies, Newton and falling apple - gravitation and the logo of Apple company represent high end technology/knowledge.
Apple in Religion: the apple signifies the sin, when snake encouraged Eve to give Adam the denied fruit by god.
Here the apple means youth as the title offers but still we can judge the painting through the religious point of view (man, woman, apple tree, apples in their hands) as a sin according to religion.
The "company grievance", you are not buying my products (McLuhan). In advertisement the apple here is an object of goods which is expected to appeal to buy it.
Apple company logo: in this advertisement the apple is a symbol of knowledge, the truth?, something unspeakable. For me the apple represent stability, perfect compatibility, great technology, suitable for gadget lover (McLuhan interpretation of narcosis)
Time: the apples are used here in direct comparison with the shell on the left. The shelf is empty the life is done, the apples still "eatable". It is about time - death - frozen image.
Here is an abstract examples. Even I do not know what it meas, the religion pop up very quickly if there I see am egg in these four objects. The egg the birth of Christ, the apple the sin or there is something else. There is an enter to a building, probably, it is really up to viewer what one can see.
The use of apple is wide but the most dominant meaning is connected to religion stories, it has its place on Christmas, we love it as a fruit. When you put keyword in google line you get most information about Apple company but the flat logo somehow I did not have connected with the Sin but with the technology.