[1] Defendant first contends that the aggravating factor found by the trial court was not “proved by the preponderance of the evidence,” as required by G.S. 15A-1340.4(a). The record does show, as defendant points out, that at the resentencing hearing the State presented no evidence at all and the defendant stipulated to no facts. But this does not mean, as defendant’s argument implies, that the court erroneously acted in a vacuum. Prosecutions and suits at law have records and a court can take judicial notice of its own proceedings and records in the same case. 1 Brandis N.C. Evidence § 13 (2d rev. ed. 1982). A part of the record of this case in the court below was the decision of the Supreme Court on defendant’s previous appeal in which it is stated that the victim of defendant’s crime was 81 years old. This is basis enough for the trial judge’s finding that she was very old. Since the law does not require the doing of vain and superfluous things, when a defendant is resentenced it is not necessary to reestablish that which the court already knows. Our decision in State v. Smith, 73 N.C. App. 637, 327 S.E. 2d 44 (1985) was to the identical effect.
[2] Defendant’s only other contention is that the victim’s age was not reasonably related to the purposes of sentencing in this case. That the victim of a crime is either very young or very old, or mentally or physically infirm, is a statutorily authorized aggravating factor under G.S. 15A-1340.4(a)(l)(j) if it is reasonably related to the purposes of sentencing in the particular case. But as was held in State v. Eason, 67 N.C. App. 460, 313 S.E. 2d 221 (1984), a victim’s age or condition is reasonably related to the purposes of sentencing only when it enhances the defendant’s culpability. Vulnerability to the particular harm that defendant’s crime entailed is the concern that this factor addresses, State v. Ahearn, 307 N.C. 584, 300 S.E. 2d 689 (1983), and in State v. Wheeler, 70 N.C. App. 191, 319 S.E. 2d 631 (1984), where robbery at gunpoint was the offense and the circumstances did not show *576that the victim’s age or condition was relied upon or taken advantage of by defendant in committing the robbery, it was held that the victim’s age was unrelated to the purposes of sentencing for that offense. But the situation is otherwise in this case and this contention is also overruled. The record in this case shows that: Defendant knocked on the victim’s door, asked to use her phone to telephone a garage to pick up his car, which he claimed was stranded; she did not let defendant in the house, but did undertake to call a garage for him; defendant saw that she was an old lady, discerned that she was alone in the house, forcibly snatched the door open, physically overpowered her feeble resistance, and choked her to unconsciousness before raping her and stealing two heaters. Under the circumstances we believe it was appropriate for the judge to conclude that the victim’s advancing years made her more vulnerable than most women to the defendant’s forcible and felonious invasion of her home and was therefore related to the purposes of sentencing in this case.
No error.
Judges Arnold and Cozort concur.