Question about malloc's address space allocation?

Question about malloc's address space allocation? -- Linux general technology-Linux programming and kernel information. The following is a detailed description. I would like to ask you two questions:
1. In user mode, the pointer returned by malloc is void * aa = malloc (100). How long is the length of the returned pointer? Is it 32-bit or 64-bit?
2. In user mode, is the virtual address space of the malloc address continuous? That is to say, starting from the middle of page I, the birth part of page I will be allocated first, then page I + 1 will be allocated, and page I + 2 will be?