Holographic Dark Energy Characterized by Conformal-age-like Length(CHDE) Conformal-age-like length scale of universe dt dta(r) a4(r)≡ dna() +(t √0 al ar+(1) Motivated from 4D space-time volume of FRW Universe g a(t)· dra(t) 0 0 Fractional energy density of CHDe Friedman Equation pde d- e 3M2H2 H2L2 3M#H=Pm pdeConformal-age-like length scale of universe Motivated from 4D space-time volume of FRW Universe Holographic Dark Energy Characterized by Conformal-age-like Length (CHDE) Fractional energy density of CHDE Friedman Equation